What I would do differently next time is the use of Bekelite lamp sockets. I guess back then I didn't have other sockets and I had to cover the bare wires with electrical tape.
To mount them insert 1 piece of threaded pipe in the 1/2" to 3/8" reducer with a nut attached to the 1/2" side. The nut won't slip throught the 3/8" opening. Secure with a second lock-nut. The lamp socket has a female 1/8" thread so that you can screw it on the pipe.
Attach the #18 lamp cord to the screw terminals in the socket.